Method and apparatus for processing a plurality of format types of video signals which include closed-caption data

ABSTRACT

In a display apparatus (PI) displaying a closed-caption (Scc, DS) multiplexed in the first and second component video signals (Scv 1 : Y, PB, and PR, Svc 2 : Y and C) received from externally provided video signal sources, a video signal selector ( 7 ) selects one of said first and second component video signals (Scv 1 , Scv 2 ); a closed-caption extractor ( 3 ) extracts the closed-caption (Scc, DS) from said selected one of first and second component video signals (Scv 1 , Scv 2 ); and a controller ( 10 ) controls the closed-caption extractor ( 3 ) based on the format type of the selected first and second component video signals (Scv 1  and Scv 2 ).

This is a Rule 1.53(b) Divisional Application of Ser. No. 09/679,817,filed Oct. 5, 2000 now U.S. Pat. No. 6,587,153.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display apparatus that will not failto display a closed-caption superimposed on a component video signalprovided thereto.

2. Description of the Background Art

In FIG. 5, the structure of a conventional display apparatus, typicallya television receiver, is schematically shown. A conventional displayapparatus PA includes a color-difference signal demodulator 1, async-separator 2, a closed-caption (hereinafter abbreviated as CC)decoder 3, an RGB processor 4, and a display 5.

The color-difference signal demodulator 1 demodulates a luminance signalY and a chroma signal C of NTSC into a color-difference signal U (B-Y)and a color difference signal V (R-Y). The sync-separator 2 separatesand extracts a horizontal synchronization signal H-SYNC and a verticalsynchronization signal V-SYNC from the luminance signal Y.

The CC (Closed-Caption) decoder 3 extracts data from a closed-captionsignal, which is a VBI signal superimposed on the NTSC video signal atthe 21H of the first field. Further, the CC decoder 3 decodes theextracted data into RGB display signals and a switching signal Ys foron-screen display process. The RGB processor 4 demodulates componentvideo signals Y, U, and V into RGB signals. The display 5 is structuredby a CRT and other components, and displays an image based on the RGBsignals.

The operation of the above display apparatus PA is now brieflydescribed. A conventional NTSC composite video signal is separated intothe luminance signal Y and the chroma signal C. These separated signalsY and C are then demodulated by the color-difference signal demodulator1 into a component video signal Scv (not shown) composed of theluminance signal Y, the color-difference signal U, and thecolor-difference signal V. Note that the luminance signal Y and thechroma signal C may be provided via a so-called S terminal.

The luminance signal Y is provided to the color-difference signaldemodulator 1 and also to the sync-separator 2. The sync-separator 2separates the horizontal synchronization signal H-SYNC and the verticalsynchronization signal V-SYNC from the luminance signal Y, and thenoutputs the separated signals to deflection circuits in the CC decoder 3and the display 5.

The CC decoder 3 extracts the caption data from the closed-captionsignal superimposed on the luminance signal Y. The CC decoder 3 alsogenerates the RGB signals R, G, and B and the switching signal Ys thatare synchronized with the synchronization signals H-SYNC and V-SYNCprovided by the sync-separator 2, and outputs the generated signals tothe RGB processor 4.

The RGB processor 4 switches, or exclusively selects the source of theRGB signals to be received based on the switching signal Ys. That is, ifthe switching signal Ys is invalid, the RGB processor 4 converts theluminance signal Y and the color-difference signals U and V provided bythe color-difference signal demodulator 1 into RGB signals (R, G, B) foroutput. On the other hand, if the switching signal Ys is valid, the RGBprocessor directly outputs the RGB signals (R, G, B) provided by the CCdecoder 3 to the display 5.

In FIG. 6, an example of the waveform of the closed-caption signalsuperimposed on the NTSC video signal (luminance signal Y) is shown. Asstated above, a closed-caption signal Scc is multiplexed (superimposed)on the 21H of the first field of the NTSC video signal. Theclosed-caption signal Scc is synchronized with a clock during a clockline CL.

The closed-caption signal Scc is composed of a start bit SB (representedby S in FIG. 6) and a 16-bit (2-byte) data stream DS that include2-byte-type control data, one-byte-type character data, and 2-byte-typespecial character data. A color burst signal is inserted between theclock line CL and the horizontal synchronization signal H-SYNC. Adetailed description of the closed-caption code system is provided inFCC 91-119 and FCC92-157 by Federal Communications Commission (FCC).Therefore, further description is omitted herein.

In the conventional display apparatus as described above, closed-captiondata can be extracted if the closed-caption data signal Scc issuperimposed on the NTSC video signal, but cannot be extracted ifsuperimposed on the component video signal. In other words, theconventional display apparatus does not support such a case where aclosed-caption signal is superimposed on the luminance signal Y fromupcoming video equipment having a terminal for a component video outputcomposed of the luminance signal Y, a color-difference signal PB (Cb),and a color-difference signal PR (Cr).

Various video signal modes such as 480 i, 480 p, and 1081 i are expectedfor digital broadcasting. Presently, video signals of such modes arereceived and demodulated by an STB (Set-Top Box), outputted ascomponents Y, PB, and PR, and coupled to a display apparatus such as atelevision receiver. Of these video signal modes, a signal of the 480i-interlace mode is more likely to have a closed-caption signalsuperimposed thereon. In such a case, when signals of the other modesare decoded, a closed-caption will be erroneously detected.

In other words, it is assumed in the display apparatus PA, as in anon-progressive DVD player, that only the 480 i-interlace video signalis outputted. However, when progressive DVD players emerge, instead ofthe 480 i-interlace video signal, a 480 p-progressive video signal of480 valid scanning lines may be provided. Furthermore, when digitaltelevision broadcasting starts, a 1080 i-interlace video signal or 720p-progressive video signal may be provided from a digital television STBrather than the 480 p-progressive video signal.

However, it is assumed that the closed-caption signal Scc issuperimposed on the 21H of the 480 i video signal. Therefore, if asignal of another mode such as the above-mentioned progressive signal isdirectly provided to the display apparatus PA as the component videosignal Scv, the CC decoder 3 may erroneously detect the providedcomponent video signal Scv and provide an erroneous character display.

SUMMARY OF THE INVENTION

Therefore, an object of the present invention is to provide a displayapparatus that provides a correct display of a closed-caption displayeven if a video signal other than the 480 i mode is utilized.

The present invention has the following features to solve the problem.

A first aspect of the present invention is directed to a displayapparatus for displaying a closed-caption multiplexed in differentformat types of video signals received from externally provided videosignal sources, the apparatus comprising:

a first component video signal receiver for receiving a first componentvideo signal from one of the video signal sources;

a second component video signal receiver for receiving a composite videosignal from another of the video signal sources to produce a secondcomponent video signal;

a selector for selecting one of the first and second component videosignals;

a closed-caption extractor for extracting the closed-caption from theselected one of first and second component video signals; and

a controller for controlling the closed-caption extractor based on theformat type of the selected one of first and second component videosignals.

According to a second aspect, in the first aspect, the controllerenables the closed-caption extractor when the second component videosignal is selected.

According to a third aspect, in the first aspect, the display apparatusfurther comprises a video format determiner for determining a videoformat type of the first component video signal based on a luminancesignal thereof when the first component video signal is selected, and

the controller controls the closed-caption extractor based on thedetermined video format type.

According to a fourth aspect, in the third aspect, the controllerenables the closed-caption extractor only when the determined videoformat type is NTSC.

According to a fifth aspect, in the third aspect, the video formatdeterminer comprises:

a synchronizing extractor for extracting a horizontal synchronizationsignal and a vertical synchronization signal from the luminance signal;

a video signal format storage for storing discrimination datadiscriminating each of plural video formats; and

a determiner for comparing the extracted horizontal and vertical signalswith the discrimination data to determine the video format type of thefirst component video signal.

These and other objects, features, aspects and advantages of the presentinvention will become more apparent from the following detaileddescription of the present invention when taken in conjunction with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing the structure of a display apparatusaccording to a first embodiment of the present invention;

FIG. 2 is a flow chart showing the operation for closed-caption processin the display apparatus of FIG. 1;

FIG. 3 is a block diagram showing the structure of a display apparatusaccording to a second embodiment of the present invention;

FIG. 4 is a block diagram showing an example modification of the displayapparatus of FIG. 3;

FIG. 5 is a block diagram showing the structure of a conventionaldisplay apparatus; and

FIG. 6 is a diagram showing a waveform of a closed-caption signal.

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment

Referring to FIG. 1, the structure of a display apparatus according to afirst embodiment of the present invention is described. A displayapparatus PI1 includes a color-difference signal demodulator 1, a CCdecoder 3, a display 5, a component video signal input terminal 6, avideo signal selector 7, a sync-separator 8, an RGB processor 9, acontroller 10, and a synchronizing signal determiner 11.

The component video signal input terminal 6 receives a first componentvideo signal Scv1 from an external component video signal sourcetypified by a digital-television STB or DVD player. The component videosignal Scv1 includes a luminance signal Y, a color-difference signal PB,and a color-difference signal PR. The first component video signal inputterminal 6 provides these signals Y, PB, and PR forming the componentvideo signal Scv1 to the video signal selector 7.

The color-difference demodulator 1 generates a second component videosignal Scv2 from a luminance signal Y and a chroma signal C obtainedbased on a composite video signal of any of various television-standardsystems, typically the NTSC system.

The second component video signal Scv2 includes a luminance signal Y, acolor-difference signal U (B-Y), and a color-difference signal V (R-Y).These signals Y, U, and V forming the second component video signal Scv2are provided to the video signal selector 7. Note that the luminancesignal Y and the chroma signal C provided to the color-differencedemodulator 1 come from a Y/C separator (not shown) after beingY/C-separated from the NTSC composite video signal thereby, or from aso-called S terminal of a video tape recorder.

The video signal selector 7 selectively outputs, based on a selectionsignal Sw provided by the controller 10, one of the first componentvideo signal Scv1 (Y, PB, PR) provided by the component video signalinput terminal 6 and the second component video signal Scv2 (Y, U, V)provided by the color-difference signal demodulator 1. The selectionsignal Sw is a two-level signal indicative of either a high-level or alow-level. The video signal selector 7 is structured to select thecomponent video signal input terminal 6 when the selection signal is atthe high-level, while to select the color-difference signal demodulator1 when the selection signal Sw is at the low-level.

The sync-separator 8, structured by a sync-separating circuit, separatesand extracts a horizontal synchronization signal H-SYNC and a verticalsynchronization signal V-SYNC from the luminance signal Y included ineither the first or second component video signal Scv1 or Scv2 foroutput to the CC decoder 3, the display 5, and the controller 10.

The synchronizing signal determiner 11 previously stores expectedhorizontal and vertical synchronization frequencies of the luminancesignal Y and the color-difference signals PB and PR of various types.Other than the synchronizing frequencies are stored as thediscrimination data necessary to determine the video format type of thecomponent video signal may be stored in the synchronizing signaldeterminer 11. The synchronizing signal determiner 11 comparesfrequencies of the horizontal and vertical synchronization signalsH-SYNC and V-SYNC provided to and measured by the controller 10 withthose previously stored in order to specify the format type of the videosignal provided.

The controller 10 generates the selection signal Sw depending on thetype of an input signal coming from a remote controller (not shown)operated by a user to control the video signal selector 7. Thecontroller 10 also generates a control signal Sc based on the type ofthe video signal specified by the synchronizing signal determiner 11 tocontrol the CC decoder 3.

The CC decoder 3 extracts closed-caption data from the closed-captionsignal Scc superimposed on the second component video signal Scv2, whichis the NTSC video signal, based on the control signal Sc provided by thecontroller 10. The CC decoder 3 carries out an on-screen displayprocess, decodes the extracted closed caption data into RGB signals (R,G, B) and the switching signal Ys, and outputs the decoded signals tothe RGB processor 9.

The RGB processor 9 generates RGB signals that correspond to the firstcomponent video signal Scv1 (Y, PB, PR) or the second component videosignal Scv2 (Y, U, V) provided by the video signal selector 7 for outputto the display 5.

The operation of the display apparatus PI1 is now described below.First, the user operates the remote controller to select the videosignal to be inputted to the display apparatus PI1. The controller 10generates the selection signal Sw based on the selection to control theswitching between the first and second component video signals providedby the video signal selector 7. If the user also selects aclosed-caption function by using the remote controller, the controller10 generates the control signal Sc to enable the CC decoder 3.

If the user selects the NTSC side, that is, the second component videosignal Scv2, the controller 10 generates the selection signal Sw forcontrolling the video signal selector 7 to select the color-differencedemodulator 1 so that the luminance signal Y and the color-differencesignals U and V are taken as input signals. As a result, the luminancesignal Y of the second component video signal Scv2 outputted from thevideo signal selector 7 is separated by the sync-separator 8 into thehorizontal and vertical synchronization signals H-SYNC and V-SYNC. Thesesynchronizing signals H-SYNC and V-SYNC are provided to a deflectioncircuit in the display 5 and also to the CC decoder 3, and act assynchronizing signals for the RGB signals and the Ys signal outputtedfrom the CC decoder 3.

In the CC decoder 3, the closed-caption data is obtained from theclosed-caption signal Scc, which is a VBI signal superimposed on theprovided luminance signal Y. The obtained closed-caption data isdecompressed by the CC decoder 3 for on-screen display depending on thesetting of the controller 10. The RGB signals (R, G, B) and theswitching signal Ys resulted from the decompression are outputted to theRGB processor 9.

The RGB processor 9 converts the first component video signal Scv1 (Y,PB, PR) or the second component video signal Scv2 (Y, U, V) selectivelyoutputted from the video signal selector 7 into RGB signals (R, G, B) ina color matrix corresponding to the selected component video signal.

However, if the switching signal Ys from the CC decoder 3 is valid, theRGB signals (R, G, B) from the CC decoder 3 are provided to the RGBprocessor 9. If the switching signal Ys is invalid, the RGB signals (R,G, B) converted from the first component video signal Scv1 (Y, PB, PR)or the second component video signal Scv2 (Y, U, V) provided by thevideo signal selector 7 are provided to the RGB processor 9. The RGBprocessor 9 carries out an image display based on the provided RGBsignals (R, G, B).

On the other hand, if the user selects the component video signal inputterminal 6 side, that is, the first component video signal Scv1, thecontroller 10 generates the selection signal Sw for controlling thevideo signal selector 7 to select the component video signal inputterminal 6 so that the luminance signal Y and the color-differencesignals PB and PR are taken as the input signal. As a result, theluminance signal Y of the first component video signal Scv1 outputtedfrom the video signal selector 7 is separated by the sync-separator 8into the horizontal and vertical synchronization signals H-SYNC andV-SYNC.

These synchronizing signals H-SYNC and V-SYNC are provided to thedeflection circuit in the display 5 and also to the CC decoder 3, andact as synchronizing signals for the RGB signals and the switchingsignal Ys outputted from the CC decoder 3. Thereafter, the operation issimilar to that in the above-mentioned case where the user selects thesecond component video signal Scv2, and therefore description is notmade herein.

Further referring to a flow chart shown in FIG. 2, the operation forclosed-caption display in the display apparatus PI1 is described indetail. First, the user operates the remote controller to select thevideo signal to be inputted to the display apparatus PI1 and theclosed-caption function.

Then, in step S2, the controller 10 generates the selection signal Swand the control signal Sc based on the selection by the user. Theprocedure then goes to a next step S4.

In step S4, the video signal selector 7 outputs either one of the firstor second component video signal Scv1 or Scv2 in response to theselection signal Sw. The CC decoder. 3 is set enabled in response to thecontrol signal Sc. The procedure then goes to a next step S6.

In step S6, if the first component video signal Scv1 (Y, PB, PR) isselected in step S2, the procedure goes to step S8.

In step S8, the controller 10 measures the frequency of the firstcomponent video signal Scv1 based on the horizontal and verticalsynchronization signals H-SYNC and V-SYNC provided by the sync-separator8. The procedure then goes to step S10.

In step S10, the controller 10 compares the frequency of the firstcomponent video signal Scv1 measured in step S8 with various frequenciesstored in the synchronizing signal determiner 11 to specify the formattype of the first component video signal Scv1. The procedure then goesto step S12.

In step S12, it is determined whether the first component video signalScv1 is specified in type or not. If Yes, the procedure goes to stepS14.

In step S14, the closed-caption data is extracted from theclosed-caption signal Scc superimposed on the first component videosignal Scv1, and a closed-caption process sub-routine for display on thedisplay 5 is executed. Then, the procedure ends.

On the other hand, if No in the above step S12, that is, if the firstcomponent video signal Scv1 cannot be specified in type, theclosed-caption process cannot be correctly carried out. Therefore, theprocedure ends right away.

Note that, if No in the above step S6, that is, if the NTSC secondcomponent video signal Scv2 satisfies the regulations of theclosed-caption signal Scc, the process for specifying the video signalthrough steps S8, S10, and S12 is not required. Therefore, the proceduregoes to step S14.

The controller 10 generates the selection signal Sw based on the type ofthe input signal through the remote controller (not shown) operated bythe user to control the video signal selector 7. The controller 10 alsogenerates the control signal Sc based on the format type of the videosignal specified by the synchronizing signal determiner 11 to controlthe CC decoder 3.

If the user selects the NTSC side, that is, the second component videosignal Scv2, the controller 10 generates the selection signal Sw forcontrolling the video signal selector 7 to select the color-differencedemodulator 1 so that the luminance signal Y and the color-differencesignals U and V are taken as input signals. As a result, the luminancesignal Y of the second component video signal Scv2 outputted from thevideo signal selector 7 is separated by the sync-separator 8 into thehorizontal and vertical synchronization signals H-SYNC and V-SYNC. Thesesynchronizing signals H-SYNC and V-SYNC are provided to the deflectioncircuit in the display 5 and also to the CC decoder 3, and act assynchronizing signals for the RGB signals and the Ys signal outputtedfrom the CC decoder 3.

In the CC decoder 3, the closed-caption data is obtained from theclosed-caption signal Scc, which is a VBI signal superimposed on theprovided luminance signal Y. The obtained closed-caption data isdecompressed by the CC decoder 3 for on-screen display depending on thesetting of the controller 10. The RGB signals (R, G, B) and theswitching signal Ys resulted from the decompression are outputted to theRGB processor 9.

The RGB processor 9 converts the first component video signal Scv1 (Y,PB, PR) or the second component video signal Scv2 (Y, U, V) selectivelyoutputted from the video signal selector 7 into RGB signals (R, G, B) ina color matrix corresponding to the selected component video signal.

However, if the switching signal Ys from the CC decoder 3 is valid, theRGB signals (R, G, B) from the CC decoder are provided to the RGBprocessor 9. If the switching signal Ys is invalid, the RGB signals (R,G, B) converted from the first component video signal Scv1 (Y, PB, PR)or the second component video signal Scv2 (Y, U, V) provided by thevideo signal selector 7 are provided to the RGB processor 9. The RGBprocessor 9 carries out an image display based on the provided RGBsignals (R, G, B).

On the other hand, if the user selects the component video signal inputterminal 6 side, that is, the first component video signal Scv1, thecontroller 10 generates the selection signal Sw for controlling thevideo signal selector 7 to select the component video signal inputterminal 6 so that the luminance signal Y and the color-differencesignals PB and PR are taken as the input signal. As a result, theluminance signal Y of the first component video signal Scv1 outputtedfrom the video signal selector 7 is separated by the sync-separator 8into the horizontal and vertical synchronization signals H-SYNC andV-SYNC.

These synchronizing signals H-SYNC and V-SYNC are provided to thedeflection circuit in the display 5 and also to the CC decoder 3, andact as synchronizing signals for the RGB signals and the switchingsignal Ys outputted from the CC decoder 3. Thereafter, the operation issimilar to that in the above-mentioned case where the user selects thesecond component video signal Scv2, and therefore description is notmade herein.

In this way, in the display apparatus PI1, either when theclosed-caption signal Scc is inputted as the luminance signal Y and thechroma signal C or when inputted as the luminance signal Y and thecolor-difference signals PB and PR, closed-caption data is obtained bythe CC decoder 3 for on-screen display.

Based on the above disclosure for the display apparatus PI1, the basicconcept of the display apparatus PI1 according to the present inventionis now described. It is assumed that, when the user selects thecomponent video signal input terminal 6, the video equipment used as avideo signal source that provides the first component video signal Scv1(Y, PB, PR) outputs only 480 i interlace video signals, like anon-progressive-support DVD player.

However, if progressive-support DVD players emerge, a 480 p-progressivevideo signal of 480 valid scanning lines may be provided. Furthermore,when digital television broadcasting starts, a 1080 i-interlace videosignal or 720 p-progressive video signal may also be provided to thecomponent video signal input terminal 6 for output from a digitaltelevision STB.

If such progressive signals are directly inputted as the first componentvideo signal Scv1 to the display apparatus PI1, the luminance signal Yand the color-difference signals PB and PR can be correctly processed bythe RGB processor 9. However, the closed-caption signal Scc is supposedto be superimposed on the 21H of the 480 i video signal, and thereforeif the other signal is inputted, the CC decoder 3 erroneously detectsthe inputted first component video signal Scv1, and may cause anerroneous character display.

To prevent the above problem, the controller 10 determines the frequencycharacteristics of the component video signal Scv1 based on thehorizontal and vertical synchronization signals H-SYNC and V-SYNCextracted from the luminance signal Y of the component video signal Scvto be actually displayed on the display 5. The controller 10 alsocompares the determined frequency characteristics with data stored inthe synchronizing signal determiner 11 to specify the format type of thecomponent video signal Scv to be displayed on the display 5. If thecomponent video signal Scv satisfies the regulations of theclosed-caption signal Scc, the closed-caption process is carried out,and, if not, the closed-caption process is inhibited for preventing anerroneous closed-caption display.

Second Embodiment

As shown in FIG. 3, a display apparatus PI2 according to a secondembodiment of the present invention is similar in structure to thedisplay apparatus PI1 shown in FIG. 1 except that a synchronizing signaldeterminer 11R is provided in place of the synchronizing signaldeterminer 11. Furthermore, the horizontal and vertical synchronizationsignals H-SYNC and V-SYNC are provided by the sync-separator 8 not tothe controller 10 but to the synchronizing signal determiner 11R. Unlikethe synchronizing signal determiner 11, the synchronizing signaldeterminer 11R specifies the format type of the video signal provided tothe display apparatus PI2 also based on the horizontal and verticalsynchronization signals H-SYNC and V-SYNC provided by the sync-separator8.

As a result, when the user selects the component video signal inputterminal 6 side (the first component video signal Scv1), thesynchronizing signal determiner 11R measures the frequencies of thehorizontal and vertical synchronization signals H-SYNC and V-SYNCprovided by the sync-separator 8, and compares the measured frequencieswith a table of video signal frequencies previously stored in thesynchronizing signal determiner 11R. If determining that a video signalother than the 480 i video signal is inputted, the controller 10immediately disables the CC decoder 3 even though the user haspreviously set the CC decoder 3 enabled.

Note that the operation of the display apparatus PI2 is quite similar tothat of the display apparatus PI1 shown in the flow chart of FIG. 2, andtherefore only the difference therebetween is now described below. Inthe display apparatus PI2, instead of the controller 10, thesynchronizing signal determiner 11R carries out measuring the frequency(step S8), comparing the frequencies (S10), and specifying the formattype of the video signal (S12). Consequently, as compared with thedisplay apparatus PI1, reduction in load on the controller 10 can beachieved. Furthermore, the synchronizing signal determiner 11R alwaysmonitors the component video signal Scv for specifying its format type.Therefore, the responsiveness to a closed-caption display instructionfrom the user can be improved.

If the user selects the NTSC side, the second component video signalScv2 is a 480 i signal composed of the luminance signal Y and the chromasignal C, whose horizontal synchronization signal H-SYNC is 15.734 kHzand whose vertical synchronization signal V-SYNC is 59.94 Hz.

Referring to FIG. 4, a modified embodiment of the display apparatusaccording to the second embodiment of the present invention isdescribed. In a display apparatus PI2R according to the modifiedembodiment, a controller 10R replaces the controller 10 constructing thedisplay apparatus PI2 shown in FIG. 3. Moreover, the horizontal andvertical synchronization signals H-SYNC and V-SYNC outputted from thesync-separator 8 are provided to the synchronizing signal determiner 11Rand also to the controller 10R. As a result, the format type of thevideo signal (Scv1) can be recognized more correctly based on thefrequency of the first component video signal Scv1 also provided to thecontroller 10R.

As stated above, according to the present invention, if a componentvideo input terminal is provided to the display apparatus such as atelevision receiver, a closed-caption can be used as in a case where theconventional composite video signal or an input from an S terminal isprovided. Furthermore, if various video signals such as 480 p, 720 p,and 1080 i signals other than the 480 i video signal are inputted,erroneous detection can be prevented, and an appropriate closed-captionsignal process can be carried out, which is an extremely-advantageouseffects of the present invention.

According to the present invention, the closed-caption signal iscorrectly obtained and reproduced on the display. Even if a signal otherthan the 480 i video signal is inputted to the display apparatus,erroneous detection of the closed-caption signal is prevented.Therefore, the user can use the closed-caption function with easy andsmooth operation, which is also an extremely-advantageous effect of thepresent invention.

While the invention has been described in detail, the foregoingdescription is in all aspects illustrative and not restrictive. It isunderstood that numerous other modifications and variations can bedevised without departing from the scope of the invention.

1. Apparatus for processing at least a component video signal and acomposite video signal which include closed-caption data, said apparatuscomprising: component video signal receiving means for receiving saidcomponent video signal as a first component video signal; compositevideo signal receiving means for receiving said composite video signalto produce a second component video signal; selection means forselecting one of said first and second component video signals;closed-caption extraction means for extracting said closed-caption datafrom said selected one of first and second component video signals;control means for controlling said closed-caption extraction means basedon a format type of said selected one of first and second componentvideo signals; and video format determination means for determining avideo format type of said first component video signal based on aluminance signal thereof when said first component video signal isselected, wherein said control means controls said closed-captionextraction means based on said determined video format type. 2.Apparatus according to claim 1, wherein said control means enables saidclosed-caption extraction means when said second component video signalis selected.
 3. Apparatus according to claim 1, wherein said controlmeans enables said closed-caption extraction means only when saiddetermined video format type is NTSC.
 4. Apparatus according to claim 1,wherein said video format determination means comprise: synchronizingextraction means for extracting a horizontal synchronization signal anda vertical synchronization signal from said luminance signal; videosignal format storing means for storing discrimination datadiscriminating each of said plurality of video formats; anddetermination means for comparing said extracted horizontal and verticalsignals with said discrimination data to determine a video format typeof said first component video signal.